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proper doors

If your fireplace is of masonry construction, you can order custom doors if need be through most any stove shop. If you have a factory built fireplace, you can only use the doors tested and listed for use with that specific model fireplace.

Aftermarket doors on factory built fireplaces generally restrict the airflow into the fireplace thus changing the thermal signature of that unit. All the testing and listing goes out the window when you cannot predict performance.
HTH,